chore(deps-dev): bump @astrojs/mdx from 3.1.9 to 4.1.0

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 3.1.9 to 4.1.0.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/mdx@4.1.0/packages/integrations/mdx)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -13,7 +13,7 @@
   },
   "devDependencies": {
     "@actions/core": "^1.11.1",
-    "@astrojs/mdx": "^3.1.9",
+    "@astrojs/mdx": "^4.1.0",
     "@astrojs/preact": "^4.0.4",
     "@astrojs/sitemap": "^3.2.1",
     "@babel/core": "^7.26.8",